急冷凝固した工具鋼の鋳片の特性

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書誌事項

タイトル別名
  • Characteristics of Rapidly Solidified Tool Steel
  • キュウレイ ギョウコシタ コウグコウ ノ チュウヘン ノ トクセイ

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説明

The rapid solidification of high speed steel was investigated by using water-cooled chill block apparatus, which was simulated to function similarly to a caterpillar-type caster or roll caster. The secondary dendrite arm spacing near the surface was 4 μm in every cast ingot. By increasing the thickness of the ingot, the dendrite arm spacing at the center also increased. By analyzing the relationship between the dendrite arm spacing and cooling rate, the cooling rate near the surface was estimated at 103°C/s and that at the center of 40 mm-thick cast ingot was 100°C/s. The size of eutectic carbide decreased with the thickness of the cast ingot. The cast ingots were heat treated at 1 150°C for 2 h. Lamellar eutectic carbide changed to the spheroidal one by heat treatment. <BR>Furthermore, plates of carbon tool steel were made by the twin roll test caster. Casting speed was 510 m/min. The size of cast plate was 12.5 mm in thickness and 260 mm in width. The carbon tool steel plate was heat-treated at 690°C for 150 h. The spheroidal cementite structure was obtained by the heat treatment. The plates of high speed steel were also made by the twin roll test caster. Fine eutectic carbide was observed in the cast plate by the heat treatment.

収録刊行物

  • 鉄と鋼

    鉄と鋼 74 (3), 457-464, 1988

    一般社団法人 日本鉄鋼協会

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